public KernelResult Start(int mainThreadPriority, ulong stackSize)
{
lock (_processLock)
{
if (_state > ProcessState.CreatedAttached)
{
return(KernelResult.InvalidState);
}
if (ResourceLimit != null && !ResourceLimit.Reserve(LimitableResource.Thread, 1))
{
return(KernelResult.ResLimitExceeded);
}
KResourceLimit threadResourceLimit = ResourceLimit;
KResourceLimit memoryResourceLimit = null;
if (_mainThreadStackSize != 0)
{
throw new InvalidOperationException("Trying to start a process with a invalid state!");
}
ulong stackSizeRounded = BitUtils.AlignUp(stackSize, KMemoryManager.PageSize);
ulong neededSize = stackSizeRounded + _imageSize;
//Check if the needed size for the code and the stack will fit on the
//memory usage capacity of this Process. Also check for possible overflow
//on the above addition.
if (neededSize > _memoryUsageCapacity ||
neededSize < stackSizeRounded)
{
threadResourceLimit?.Release(LimitableResource.Thread, 1);
return(KernelResult.OutOfMemory);
}
if (stackSizeRounded != 0 && ResourceLimit != null)
{
memoryResourceLimit = ResourceLimit;
if (!memoryResourceLimit.Reserve(LimitableResource.Memory, stackSizeRounded))
{
threadResourceLimit?.Release(LimitableResource.Thread, 1);
return(KernelResult.ResLimitExceeded);
}
}
KernelResult result;
KThread mainThread = null;
ulong stackTop = 0;
void CleanUpForError()
{
mainThread?.Terminate();
HandleTable.Destroy();
if (_mainThreadStackSize != 0)
{
ulong stackBottom = stackTop - _mainThreadStackSize;
ulong stackPagesCount = _mainThreadStackSize / KMemoryManager.PageSize;
MemoryManager.UnmapForKernel(stackBottom, stackPagesCount, MemoryState.Stack);
}
memoryResourceLimit?.Release(LimitableResource.Memory, stackSizeRounded);
threadResourceLimit?.Release(LimitableResource.Thread, 1);
}
if (stackSizeRounded != 0)
{
ulong stackPagesCount = stackSizeRounded / KMemoryManager.PageSize;
ulong regionStart = MemoryManager.StackRegionStart;
ulong regionSize = MemoryManager.StackRegionEnd - regionStart;
ulong regionPagesCount = regionSize / KMemoryManager.PageSize;
result = MemoryManager.AllocateOrMapPa(
stackPagesCount,
KMemoryManager.PageSize,
0,
false,
regionStart,
regionPagesCount,
MemoryState.Stack,
MemoryPermission.ReadAndWrite,
out ulong stackBottom);
if (result != KernelResult.Success)
{
CleanUpForError();
return(result);
}
_mainThreadStackSize += stackSizeRounded;
stackTop = stackBottom + stackSizeRounded;
}
ulong heapCapacity = _memoryUsageCapacity - _mainThreadStackSize - _imageSize;
result = MemoryManager.SetHeapCapacity(heapCapacity);
if (result != KernelResult.Success)
{
CleanUpForError();
return(result);
}
HandleTable = new KHandleTable(System);
result = HandleTable.Initialize(Capabilities.HandleTableSize);
if (result != KernelResult.Success)
{
CleanUpForError();
return(result);
}
mainThread = new KThread(System);
result = mainThread.Initialize(
_entrypoint,
0,
stackTop,
mainThreadPriority,
DefaultCpuCore,
this);
if (result != KernelResult.Success)
{
CleanUpForError();
return(result);
}
result = HandleTable.GenerateHandle(mainThread, out int mainThreadHandle);
if (result != KernelResult.Success)
{
CleanUpForError();
return(result);
}
mainThread.SetEntryArguments(0, mainThreadHandle);
ProcessState oldState = _state;
ProcessState newState = _state != ProcessState.Created
? ProcessState.Attached
: ProcessState.Started;
SetState(newState);
//TODO: We can't call KThread.Start from a non-guest thread.
//We will need to make some changes to allow the creation of
//dummy threads that will be used to initialize the current
//thread on KCoreContext so that GetCurrentThread doesn't fail.
/* Result = MainThread.Start();
*
* if (Result != KernelResult.Success)
* {
* SetState(OldState);
*
* CleanUpForError();
* } */
mainThread.Reschedule(ThreadSchedState.Running);
return(result);
}
}
private KernelResult CreateThread(
ulong entrypoint,
ulong argsPtr,
ulong stackTop,
int priority,
int cpuCore,
out int handle)
{
handle = 0;
KProcess currentProcess = _system.Scheduler.GetCurrentProcess();
if (cpuCore == -2)
{
cpuCore = currentProcess.DefaultCpuCore;
}
if ((uint)cpuCore >= KScheduler.CpuCoresCount || !currentProcess.IsCpuCoreAllowed(cpuCore))
{
return(KernelResult.InvalidCpuCore);
}
if ((uint)priority >= KScheduler.PrioritiesCount || !currentProcess.IsPriorityAllowed(priority))
{
return(KernelResult.InvalidPriority);
}
long timeout = KTimeManager.ConvertMillisecondsToNanoseconds(100);
if (currentProcess.ResourceLimit != null &&
!currentProcess.ResourceLimit.Reserve(LimitableResource.Thread, 1, timeout))
{
return(KernelResult.ResLimitExceeded);
}
KThread thread = new KThread(_system);
KernelResult result = currentProcess.InitializeThread(
thread,
entrypoint,
argsPtr,
stackTop,
priority,
cpuCore);
if (result != KernelResult.Success)
{
currentProcess.ResourceLimit?.Release(LimitableResource.Thread, 1);
return(result);
}
result = _process.HandleTable.GenerateHandle(thread, out handle);
if (result != KernelResult.Success)
{
thread.Terminate();
currentProcess.ResourceLimit?.Release(LimitableResource.Thread, 1);
}
return(result);
}
private KernelResult CreateThread(
ulong Entrypoint,
ulong ArgsPtr,
ulong StackTop,
int Priority,
int CpuCore,
out int Handle)
{
Handle = 0;
KProcess CurrentProcess = System.Scheduler.GetCurrentProcess();
if (CpuCore == -2)
{
CpuCore = CurrentProcess.DefaultCpuCore;
}
if ((uint)CpuCore >= KScheduler.CpuCoresCount || !CurrentProcess.IsCpuCoreAllowed(CpuCore))
{
return(KernelResult.InvalidCpuCore);
}
if ((uint)Priority >= KScheduler.PrioritiesCount || !CurrentProcess.IsPriorityAllowed(Priority))
{
return(KernelResult.InvalidPriority);
}
long Timeout = KTimeManager.ConvertMillisecondsToNanoseconds(100);
if (CurrentProcess.ResourceLimit != null &&
!CurrentProcess.ResourceLimit.Reserve(LimitableResource.Thread, 1, Timeout))
{
return(KernelResult.ResLimitExceeded);
}
KThread Thread = new KThread(System);
KernelResult Result = CurrentProcess.InitializeThread(
Thread,
Entrypoint,
ArgsPtr,
StackTop,
Priority,
CpuCore);
if (Result != KernelResult.Success)
{
CurrentProcess.ResourceLimit?.Release(LimitableResource.Thread, 1);
return(Result);
}
Result = Process.HandleTable.GenerateHandle(Thread, out Handle);
if (Result != KernelResult.Success)
{
Thread.Terminate();
CurrentProcess.ResourceLimit?.Release(LimitableResource.Thread, 1);
}
return(Result);
}